STM Study of Gold(I) Pyrazolates: Distinct Morphologies, Layer Evolution, and Cooperative Dynamics
Author(s)den Boer, Duncan; Krikorian, Markrete; Esser, Birgit; Swager, Timothy Manning
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We describe the first study of trinuclear gold(I) pyrazolates on the molecular level by time-dependent scanning tunneling microscopy (STM). On the graphite/1-octanoic acid interface dodecyl-functionalized gold pyrazolates formed concentration-controlled morphologies. We found two types of monomeric packing and one dimeric type with two trinuclear gold pyrazolates next to each other on the surface. For an octadecyl-functionalized derivative all studied concentrations resulted in a dimeric morphology. However, different concentrations led to different transient states during the layer evolution. At low concentrations, a transient monomeric state was present with the alkyl chains in a gauche-conformation that subsequently converted to a more optimized anti-conformation. At higher concentrations a less stable “line” polymorph was observed. The confinement of the molecules to the surface led to cooperative dynamics, in which two molecules in a dimer moved as if they were one particle. Furthermore, in a higher level of cooperativity, the rotation of one dimer appears to induce rotations in coupled neighboring dimers.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
The Journal of Physical Chemistry C
American Chemical Society (ACS)
Den Boer, Duncan, Markrete Krikorian, Birgit Esser, and Timothy M. Swager. “STM Study of Gold(I) Pyrazolates: Distinct Morphologies, Layer Evolution, and Cooperative Dynamics.” The Journal of Physical Chemistry C 117, no. 16 (April 25, 2013): 8290–8298.
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